Two cases of acquired localized hypertrichosis associated with cellulitis and contusion

Hypertrichosis refers to the increase of hair density or length beyond the accepted limits of normal for a particular age, race, or sex. It is an overgrowth of hair in androgen-independent areas and it differs from hirsutism, which refers to hair growth in women in areas of the body where hair growth is under androgen control. It may be classified into congenital and acquired types according to age of development, and localized or generalized types according to the range of involvement. Acquired localized hypertrichosis may occur secondary to infective or inflammatory diseases, traumas, drugs, fracture and cast, lymphedema, sympathetic dystrophy, topical steroid application, denervation, or congenital AV fistula. Any situation that results in persistent and repetitious inflammation in the dermis or individual susceptibility may cause hypertrichosis. We report two cases of acquired localized hypertrichosis associated with cellulitis and contusion.